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STOCKHOLDERS' EQUITY: (Details Textual) (USD $)
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Share-Based Compensation Arrangement By Share-Based Payment Award Options Vested In Period 0 0 108,725 95,064
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Stock Options $ 39,000   $ 39,000  
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition     8 months  
Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Weighted Average Grant Date Fair Value (in dollars per share)     $ 3.15  
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Share-based Awards Other than Options 238,000   238,000  
Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Period For Recognition     13 months  
Stock-based compensation 55,000 37,000 145,000 127,000
Stock Granted, Value, Share-based Compensation, Gross   150,600   150,600
Repurchase Program 2013 [Member]
       
Stock Repurchase Program, Authorized Amount     3,500,000  
May 2013 Repurchase Program [Member]
       
Stock Repurchase Program, Authorized Amount     1,500,000  
January Repurchase Program 2013 [Member]
       
Stock Repurchase Program, Authorized Amount     2,000,000  
Non Executive Directors [Member]
       
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures, Total 0   109,645  
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage     50.00%  
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period     2 years  
Non Executive Directors One [Member]
       
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures, Total     21,929  
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures, Total     50,000  
Non Executive Directors Two [Member]
       
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures, Total     21,929  
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures, Total     50,000  
Non Executive Directors Three [Member]
       
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures, Total     21,929  
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures, Total     50,000  
Non Executive Directors Four [Member]
       
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures, Total     21,929  
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures, Total     50,000  
Non Executive Directors Five [Member]
       
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures, Total     21,929  
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures, Total     50,000  
Common Class A [Member]
       
Repurchase Of Common Stock Shares 1,100   32,669  
Repurchase Of Common Stock Price Per Share (in dollars per share) $ 2.41   $ 2.17  
Stock Repurchase Program, Remaining Authorized Repurchase Amount     57,000  
Repurchase Of Common Stock Value 2,655   70,986  
Common Class A [Member] | Stock Option and Restricted Stock Grant Plan 1999 [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 1,408,099   1,408,099  
Common Class D [Member]
       
Repurchase Of Common Stock Shares 512,300   2,630,574  
Repurchase Of Common Stock Price Per Share (in dollars per share) $ 2.36   $ 2.05  
Stock Repurchase Program, Remaining Authorized Repurchase Amount     57,000  
Repurchase Of Common Stock Value $ 1,209,108   $ 5,397,734  
Common Class D [Member] | Stock Option and Restricted Stock Grant Plan 1999 [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 10,816,198   10,816,198  
Common Class D [Member] | Stock Plan 2009 [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 8,250,000   8,250,000  
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant 4,614,627   4,614,627  
Common Class D [Member] | Amended and Restated 2009 Stock Plan [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant 7,000,000   7,000,000  
Share-based Compensation Arrangement by Share-based Payment Award, Maximum Number of Shares Per Employee     1,000,000